What is the social security contribution base 1800 grade

Five grades. Individual contributions and collective subsidies are set up seven grades, the annual standard is 360 yuan, 600 yuan, 900 yuan, 1,200 yuan, 1,800 yuan, 3,600 yuan, 4,800 yuan. The contributions are gradually increasing. If you are flexibly employed, you can pay the lowest tier, the cost is relatively low and you only need to pay a few hundred dollars a year. If you work for a company, the company pays the first or second tier, which is more expensive and costs a few thousand dollars a year. And the part of the company to bear is also different, large companies may bear 80%, small companies may only bear 50%, the key to see how the company's welfare benefits.